Display sub-items on calendar view / mobile app

It is not currently possible to view sub-items on the mobile calendar experience.
Because the team is working out on site with our customers we rely heavily on the mobile app. The calendar view is really important for the team to quickly understand who is going where on any given day.
Our team would like to use sub-items to detail the different phases of any given job. A different engineer may be assigned to each phase, which takes place over the course of several days or weeks.
We’re currently being forced to use different items for each phase of a project because of this limitation with the calendar view. This means we have several disconnected update threads and are having to repeat a lot of basic information at the item level (customer name, address, PO numbers etc).
Being able to view sub-items on the calendar would allow the team to easily view which phase of any given project is currently in progress and access the information relevant the overall project.
Today, you cannot view which projects on the calendar have sub-items without opening each individual item/job, which then takes you back to the main table view making it much harder to understand dates.